The impairment of permeability in the near well bore region is dependent upon fluid loss to the formation. The dynamic filtration properties of KCl-Polymer and Gypsum-lignosulphonate muds have been individually investigated and the role of individual components has been analysed. The associated permeability impairment due to particle invasion and the response of cores to backflushing has also been investigated. The scanning electron microscope has been employed to qualitatively identify particulate plugging.

Keywords:
filter cake, permeability impairment, fluid loss, drilling fluid property, particle, mechanism, low annular velocity, annular velocity, drilling fluids and materials, filtration
Subjects:
Drilling Fluids and Materials, Drilling fluid selection and formulation (chemistry, properties)
Copyright 1982, Society of Petroleum Engineers of AIME
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